<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>

    <el-form label-width="120px">

      <el-form-item>
        <el-button type="text" @click="addChapterForm">添加章节</el-button>
          <!-- 章节 -->
          <ul class="chanpterList">
              <li
                  v-for="chapter in chapterNestedList"
                  :key="chapter.id">
                  <p>
                      {{ chapter.title }}

                      <span class="acts">
                          <el-button type="text"  @click="addVideoForm(chapter.id)">添加课时</el-button>
                          <el-button style="" type="text" @click="getChapterInfo(chapter.id)">编辑</el-button>
                          <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                      </span>
                  </p>

                  <!-- 视频 -->
                  <ul class="chanpterList videoList">
                      <li
                          v-for="video in chapter.children"
                          :key="video.id">
                          <p>{{ video.title }}
                              <span class="acts">
                                  <el-button type="text" @click="getVideoInfo(video.id)">编辑</el-button>
                                  <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                              </span>
                          </p>
                      </li>
                  </ul>
              </li>
          </ul>
          <div>
              <el-button @click="previous">上一步</el-button>
              <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
          </div>
      
      </el-form-item>
    </el-form>

    <!--弹出框，输入分类名称-->
  <el-dialog :visible.sync="dialogFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
              <el-input v-model="chapter.title"/>
          </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
          <el-button @click="dialogFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
  </el-dialog>

      <!--弹出框，输入课时名称-->
<!-- 添加和修改课时表单 -->
<el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
  <el-form :model="video" label-width="120px">
    <el-form-item label="课时标题">
      <el-input v-model="video.title"/>
    </el-form-item>
    <el-form-item label="课时排序">
      <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
    </el-form-item>
    <el-form-item label="是否免费">
      <el-radio-group v-model="video.free">
        <el-radio :label="true">免费</el-radio>
        <el-radio :label="false">默认</el-radio>
      </el-radio-group>
    </el-form-item>
    <el-form-item label="上传视频">
      <el-upload
            :on-success="handleVodUploadSuccess"
           :on-remove="handleVodRemove"
           :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/admin/vod/video/upload'"
            :limit="1"
            class="upload-demo">
      <el-button size="small" type="primary">上传视频</el-button>
      <el-tooltip placement="right-end">
          <div slot="content">最大支持1G，<br>
              支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
              GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
              MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
              SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
          <i class="el-icon-question"/>
      </el-tooltip>
      </el-upload>
  </el-form-item>
  </el-form>
  <div slot="footer" class="dialog-footer">
    <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
    <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
  </div>
</el-dialog>

  </div>
</template>

<script>
import chapter from '@/api/chapter'
import video from '@/api/video'

export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      id: '',
      chapterId: '', // 课时所在的章节id
      chapterNestedList: [], // 章节嵌套视频列表
      dialogFormVisible: false,
      chapter: {// 章节对象
        title: '',
        sort: 0
      },
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      dialogVideoFormVisible: false,
      video: {//小节对象
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName: ''
      },
      fileList: [],//上传文件列表
       BASE_API: process.env.BASE_API // 接口API地址
    }
  },

  created() {
    console.log('chapter created')
    this.init()
  },

  methods: {
    init() {
      if(this.$route.params && this.$route.params.id) {
        this.id = this.$route.params.id
        this.getChapterVideoList()
      }
    },
    addChapterForm(){
      //弹框  
      this.dialogFormVisible = true
      this.chapter.title = ''
      this.chapter.id = ''
    },
    addVideoForm(chapterId){
      this.dialogVideoFormVisible = true; 
      this.chapterId = chapterId
      this.video.id = ''
      this.video.title = ''
      this.video.sort = ''
      this.fileList = []

    },
 
    //成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId  
      console.log("this.video.videoSourceId"+this.video.videoSourceId)
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    beforeVodRemove(file,fileList){
         return this.$confirm(`确定移除 ${file.name}？`)
    },
    handleVodRemove(file, fileList) {
      video.removeById(this.video.videoSourceId).then(response=>{
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
        this.fileList = []
        this.$message({
          type: 'success',
          message: '删除成功'
        })
       })
    },
    getChapterVideoList() {
      chapter.getNestedTreeList(this.id)
        .then((response) => {
            this.chapterNestedList = response.data.items
        }) 
    },
    //小节操作的方法
    saveOrUpdateVideo() {
      //判断点击确定，做添加操作，还是修改操作
      if(!this.video.id) {
        //添加
        this.saveVideoData()
      } else {
        //修改
        this.updateVideoData()
      }
    },
    //添加小节
    saveVideoData() {
      debugger
      this.video.courseId = this.id//课程id
      this.video.chapterId = this.chapterId //章节id
      video.addVideo(this.video)
        .then(response => {
          this.$message({
            type: 'success',
            message: '保存成功!'
          })
          this.helpSaveVideo()
        })
    },
    //根据id查询小节数据回显
    getVideoInfo(id) {
        this.dialogVideoFormVisible = true
        video.getVideoId(id).then(response => {
            this.video = response.data.videoInfo
             this.fileList = [{'name': this.video.videoOriginalName}]
        })
    },
    //修改小节
    updateVideoData() {
      video.updateVideo(this.video).then(response => {
          this.$message({
            type: 'success',
            message: '修改成功!'
          })
          this.helpSaveVideo()
        })
    },
    //删除小节的方法
    removeVideo(id) {
        this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          return video.deleteVideo(id)
        }).then(() => {
          this.getChapterVideoList()// 刷新列表
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        }).catch((response) => { // 失败
          if (response === 'cancel') {
            this.$message({
            type: 'info',
            message: '已取消删除'
          })
      }
    })
  },
    helpSaveVideo() {
      this.dialogVideoFormVisible = false// 如果保存成功则关闭对话框
      this.getChapterVideoList()// 刷新列表
      this.video.title = ''// 重置章节标题
      this.video.sort = 0// 重置章节标题
      this.video.videoSourceId = ''// 重置视频资源id
      this.saveVideoBtnDisabled = false
    },

    //章节操作的方法
    saveOrUpdate() {
      this.saveBtnDisabled = true
      //判断点击确定，做添加操作，还是修改操作
      if(!this.chapter.id) {
        //添加
        this.saveData()
      } else {
        //修改
        this.updateData()
      }
    },
    //根据章节id查询章节的信息
    getChapterInfo(id) {
        this.dialogFormVisible = true//弹框显示
        chapter.getChapterId(id)
          .then(response => {
            this.chapter = response.data.chapterData
          })
    },
    //添加章节的方法
    saveData() {
      this.chapter.courseId = this.id
      chapter.addChapter(this.chapter)
        .then(response => {
          this.$message({
            type: 'success',
            message: '保存成功!'
          })
          //调用方法关闭弹框，刷新列表，表单清空
          this.helpSave()
        }).catch((response) => {
          this.$message({
            type: 'error',
            message: '保存失败'
          })
        })
    },
    //修改课程章节的方法
    updateData() {
      chapter.updateChapter(this.chapter)
        .then(response => {
            this.$message({
              type: 'success',
                message: '修改成功!'
              })
              this.helpSave()
          }).catch((response) => {
            // console.log(response)
            this.$message({
              type: 'error',
              message: response.message
            })
          })
    },
    //删除章节的方法
    removeChapter(id) {
      this.$confirm('删除章节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          //点击确定在这里执行
          //请求后台接口，把返回数据return，下面执行
          return chapter.deleteChapter(id)
        }).then(response => {
          this.$message({
              type: 'success',
              message: '删除成功!'
          })
          this.helpSave()
        }).catch((response) => {
          //点击取消在这里执行
          //代码有异常在这里执行
          if (response === 'cancel') {
              this.$message({
                  type: 'info',
                  message: '已取消删除'
              })
          } else {
              this.$message({
                  type: 'error',
                  message: '删除失败'
              })
          }
        });
    },
    helpSave(){
      this.dialogFormVisible = false// 如果保存成功则关闭对话框
      this.getChapterVideoList()// 刷新列表
      this.chapter.title = ''// 重置章节标题
      this.chapter.sort = 0// 重置章节标题
      this.saveBtnDisabled = false
    },
    previous() {
      console.log('previous')
      this.$router.push({ path: '/edu/course/info/'+this.id })
    },

    next() {
      console.log('next')
      this.$router.push({ path: '/edu/course/publish/'+this.id })
    }
  }
}
</script>

<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>